How can can i subtract the value of the column in each row ?

I want to subtract the value of the column in each row if the row is not enough then continue to next row.
For example
ID QTY
A 20
B 40
C 60
I want to update this table by subtract the value of the column (QTY) out 70 so the result i want will be
ID QTY
A 20 - 70 = -50 --> 0 this row will be updated to 0 and 50 will continue to next row
B 40 - 50 = -10 --> 0   this row will be updated to 0 and 10 will continue to next row
C 60 - 10 = 50 --> Stop loop
How can i write the sql query for this operation , Thanks

Please post DDL, so that people do not have to guess what the keys, constraints, Declarative Referential Integrity, data types, etc. in your schema are. Learn how to follow ISO-11179 data element naming conventions and formatting rules. You have no idea,
do you? Temporal data should use ISO-8601 formats. Code should be in Standard SQL as much as possible and not local dialect.
This is minimal polite behavior on SQL forums. What did you try on your own before posting? I will bet that you did nothing! You expect other people to do your job or homework for you.
>> I want to subtract the value of the column in each row if the row is not enough then continue to next row. <<
This makes no sense. Rows have no ordering; that is a spreadsheet. There is no such thing as a generic “id” in RDBMS. And an identifier is not a sequence which would have an ordering.
CREATE TABLE Foobar
(something_seq INTEGER NOT NULL PRIMARY KEY,
onhand_qty INTEGER NOT NULL);
Learn how to use the SUM()OVER() and LAG() aggregate functions, post what you tried for yourself and then we will help you.
--CELKO-- Books in Celko Series for Morgan-Kaufmann Publishing: Analytics and OLAP in SQL / Data and Databases: Concepts in Practice Data / Measurements and Standards in SQL SQL for Smarties / SQL Programming Style / SQL Puzzles and Answers / Thinking
in Sets / Trees and Hierarchies in SQL

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